"The Enigma of Amigara Fault" is a perfect example of this method of storytelling by Junji Ito. It ends right at the climax, when we find out what exactly happens to the people that disappear into the mountain.... and the rest is up to our imaginations.
Another good example of a good cliffhanger ending? The ending of the game "Life is Strange", if you choose to save your friend, Chloe (sorry for any spoilers here, the game has been out for a while though). It's the sort of ending that makes you question the final decision you made in the game, and wonder, "Did I make the right choice? What's next for them?" But you're still satisfied because you obtained some sort of goal and solved some sort of conflict (in this case, rescuing Chloe).
A bad example? Just off the top of my head, at the end of the game Dying Light (I apologize for using game references and not comic/writing ones lol) your troop finds out there's a cure, or something, and they decide to go look for it. Aaaand that's it. No actual resolve, no finding out if they did find the cure, that's just it. It makes all the hours of work and gameplay leading up to it seem pointless (take what I say with grains of salt though, I haven't played the game, I'm going off what my bf has revealed to me about the ending).
For me, personally, if you're going to end a story with a cliffhanger, it shouldn't leave so many questions left unanswered that the readers feel robbed of the experience.
The ending I've got planned out for Time Gate can be considered a cliffhanger, but one of those cliffhangers that I'm HOPING the readers will be satisfied with. I want my readers to continue to theorize though - if there's nothing I love more than a good cliffhanger, it's leaving things to the collective mind of the readers to theorize upon and wonder about. When it ends, all of the major, important questions will be answered - and all that will be left is, "I wonder what's next for them?" But not a desperate enough plea that the readers will feel like they've been ripped off (again though, this is all hopefully - I'm gonna try my damn hardest lol)
If you've got the sort of cliffhanger ending that just subtly hints at there being something afterwards, but nothing so substantial that the readers will feel like you're copping out, I say go for it. But if you're ending it on a cliffhanger just for the sake of doing so and you haven't properly wrapped up the story and it just raises more questions that your readers now know aren't going to be answered, then I would refrain from it. It really depends on what your story is, how it plays out, and whether or not a cliffhanger would be the appropriate way to close the book.